Shape Analysis and Classification: Theory and Practice
Shape Analysis and Classification: Theory and Practice
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Stabilometry is routinely used to asses postural steadiness of human body by measuring the movements of the centre of pressure (postural sway) of a standing subject with a force platform. Data acquisition time dependence of various postural sway parameters has been studied by analysing simulated data. A model was developed that described the centre of pressure movements as a random walker fixed to an elastic tether. Data series of various lengths that were simulated with different values of the elastic parameter were analysed by the same procedure as is normally used for the experimental ones. The total area of the simulated stabilogram and its ratio to the central area, as determined by the principal component analysis, were found to depend not only on the elastic parameter but also on the total path length and on the data acquisition time.